Bug 1406494 - Fix spelling of the environment variable.

MozReview-Commit-ID: KE3Wejl87hg

--HG--
extra : amend_source : 62d4d8aac85a20dab055dc86938a8a2f167d162e

gfx/layers/wr/WebRenderBridgeParent.cpp

@@ -66,7 +66,7 @@ bool gfx_use_wrench()
 
 const char* gfx_wr_resource_path_override()
 {
-  const char* resourcePath = PR_GetEnv("WR_RESOURCE_Path");
+  const char* resourcePath = PR_GetEnv("WR_RESOURCE_PATH");
   if (!resourcePath || resourcePath[0] == '\0') {
     return nullptr;
   }